# Estimate 19 8/9-10 1/8 1989-1018
Convert 1989 to an improper fraction.
A mixed number is an addition of its whole and fractional parts.
19+89-1018
Add 19 and 89.
To write 19 as a fraction with a common denominator, multiply by 99.
19⋅99+89-1018
Combine 19 and 99.
19⋅99+89-1018
Combine the numerators over the common denominator.
19⋅9+89-1018
Simplify the numerator.
Multiply 19 by 9.
171+89-1018
Add 171 and 8.
1799-1018
1799-1018
1799-1018
1799-1018
Convert 1018 to an improper fraction.
A mixed number is an addition of its whole and fractional parts.
1799-(10+18)
Add 10 and 18.
To write 10 as a fraction with a common denominator, multiply by 88.
1799-(10⋅88+18)
Combine 10 and 88.
1799-(10⋅88+18)
Combine the numerators over the common denominator.
1799-10⋅8+18
Simplify the numerator.
Multiply 10 by 8.
1799-80+18
Add 80 and 1.
1799-818
1799-818
1799-818
1799-818
To write 1799 as a fraction with a common denominator, multiply by 88.
1799⋅88-818
To write -818 as a fraction with a common denominator, multiply by 99.
1799⋅88-818⋅99
Write each expression with a common denominator of 72, by multiplying each by an appropriate factor of 1.
Multiply 1799 and 88.
179⋅89⋅8-818⋅99
Multiply 9 by 8.
179⋅872-818⋅99
Multiply 818 and 99.
179⋅872-81⋅98⋅9
Multiply 8 by 9.
179⋅872-81⋅972
179⋅872-81⋅972
Combine the numerators over the common denominator.
179⋅8-81⋅972
Simplify the numerator.
Multiply 179 by 8.
1432-81⋅972
Multiply -81 by 9.
1432-72972
Subtract 729 from 1432.
70372
70372
The approximate value of 1989-1018 found by front end estimation.
1989-1018≈70372
Estimate 19 8/9-10 1/8

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